Granite Island Group is the International Leader in Technical Surveillance Counter Measures, Telecommunications Security, Counterintelligence, and Technical Security Consulting.

103 Library Lane PO Box 1280 Valparaiso, Indiana 46384-1280 24 Hour Phone: 219.548.8294 Toll Free: 866.872.2749 Facsimile: 219.548.0059 E-mail: mail@harpernet.com Harpernet Investigative Services is a full-service, licensed and fully-insured, private detective agency. We are centrally located in Valparaiso, Indiana, fifty miles southeast of Chicago, fifty eight miles west of South Bend and one ...